View source for 3mdf


==Crystal structure of the RRM domain of Cyclophilin 33==
<StructureSection load='3mdf' size='340' side='right' caption='[[3mdf]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3mdf]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3MDF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3MDF FirstGlance]. <br>
</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PPIE, CYP33 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Peptidylprolyl_isomerase Peptidylprolyl isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.2.1.8 5.2.1.8] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3mdf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3mdf OCA], [http://pdbe.org/3mdf PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3mdf RCSB], [http://www.ebi.ac.uk/pdbsum/3mdf PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3mdf ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/PPIE_HUMAN PPIE_HUMAN]] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Combines RNA-binding and PPIase activities. May be involved in muscle- and brain-specific processes. May be involved in pre-mRNA splicing. 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/md/3mdf_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=3mdf ConSurf].
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== Publication Abstract from PubMed ==
The nuclear protein cyclophilin 33 (Cyp33) is a peptidyl-prolyl cis-trans isomerase that catalyzes cis-trans isomerization of the peptide bond preceding a proline and promotes folding and conformational changes in folded and unfolded proteins. The N-terminal RNA-recognition motif (RRM) domain of Cyp33 has been found to associate with the third plant homeodomain (PHD3) finger of the mixed lineage leukemia (MLL) proto-oncoprotein and a poly(A) RNA sequence. Here, we report a 1.9 A resolution crystal structure of the RRM domain of Cyp33 and describe the molecular mechanism of PHD3 and RNA recognition. The Cyp33 RRM domain folds into a five-stranded antiparallel beta-sheet and two alpha-helices. The RRM domain, but not the catalytic module of Cyp33, binds strongly to PHD3, exhibiting a 2 muM affinity as measured by isothermal titration calorimetry. NMR chemical shift perturbation (CSP) analysis and dynamics data reveal that the beta strands and the beta2-beta3 loop of the RRM domain are involved in the interaction with PHD3. Mutations in the PHD3-binding site or deletions in the beta2-beta3 loop lead to a significantly reduced affinity or abrogation of the interaction. The RNA-binding pocket of the Cyp33 RRM domain, mapped on the basis of NMR CSP and mutagenesis, partially overlaps with the PHD3-binding site, and RNA association is abolished in the presence of MLL PHD3. Full-length Cyp33 acts as a negative regulator of MLL-induced transcription and reduces the expression levels of MLL target genes MEIS1 and HOXA9. Together, these in vitro and in vivo data provide insight into the multiple functions of Cyp33 RRM and suggest a Cyp33-dependent mechanism for regulating the transcriptional activity of MLL.

Molecular mechanism of MLL PHD3 and RNA recognition by the Cyp33 RRM domain.,Hom RA, Chang PY, Roy S, Musselman CA, Glass KC, Selezneva AI, Gozani O, Ismagilov RF, Cleary ML, Kutateladze TG J Mol Biol. 2010 Jul 9;400(2):145-54. Epub 2010 May 8. PMID:20460131<ref>PMID:20460131</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Cyclophilin|Cyclophilin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Human]]
[[Category: Peptidylprolyl isomerase]]
[[Category: Chang, P Y]]
[[Category: Cleary, M L]]
[[Category: Glass, K C]]
[[Category: Gozani, O]]
[[Category: Hom, R A]]
[[Category: Ismagilov, R F]]
[[Category: Kutateladze, T G]]
[[Category: Mussleman, C A]]
[[Category: Roy, S]]
[[Category: Seleznevia, A I]]
[[Category: Cyp33]]
[[Category: Isomerase]]
[[Category: Mll]]
[[Category: Mrna processing]]
[[Category: Mrna splicing]]
[[Category: Nucleus]]
[[Category: Phd finger]]
[[Category: Rna binding protein]]
[[Category: Rna-binding]]
[[Category: Rotamase]]
[[Category: Rrm domain]]
[[Category: Spliceosome]]